package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /*
     * @Description  切入点
     **/
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    /*
     * @Description  前置通知,在通知中进行字段填充
     **/
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段填充...");
//        获取到当前被拦截的方法的数据库操作类型

        MethodSignature signature = (MethodSignature) joinPoint.getSignature(); //方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); //获得方法上的注解对象
        OperationType operationType = autoFill.value();
//        获取到当前被拦截方法的参数--实体对象
        Object[]  args = joinPoint.getArgs();
        if (args==null || args.length==0){
            return;
        }

        Object object = args[0];
//        准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
//        根据当前的数据类型,通过反射为对应的数据类型进行赋值
        if (operationType==OperationType.INSERT){
            try {
                Method setCreateTime = object.getClass().getMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = object.getClass().getMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setupdateuser = object.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                Method setUpdateTime = object.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
//                通过反射赋值
                setCreateTime.invoke(object,now);
                setCreateUser.invoke(object,currentId);
                setupdateuser.invoke(object,currentId);
                setUpdateTime.invoke(object,now);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if (operationType==OperationType.UPDATE){
            try {
                Method setupdateuser = object.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                Method setUpdateTime = object.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
//                通过反射赋值
                setupdateuser.invoke(object,currentId);
                setUpdateTime.invoke(object,now);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }
}
